Re: 51 8n

If it were mine, I would do a compression test and if there is a low cylinder, take off the valve covers and check for a valve that is sticking part-open ...maybe cam/lifter is hammering on the valve stem. If there is compression on all cylinders, I would remover the oil pan and inspect the main and rod bearings. That should tell you what needs to be done next.

That's exactly where I would start too or even before that It wouldn't hurt to leave key off and just turn it over a few times to see if you hear anything without it running, maybe even using a piece of hose or tubing against the motor. just my opinion.

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